Exercise bike



FIG. 1 is a perspective view of an exercise bike showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of an exercise bike having a wheel guard positioned between a fork and an inclined top tube of the frame body; and,

FIG. 9 is a left side lavational view of an exercise bike having a wheel guard positioned between a fork and an inclined top tube of the frame body.

The broken line showing of the wheel guard and the computer in FIGS. 8 and 9 is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

The ornamental design for an exercise bike, as shown and described. 